netdev - [PATCH net-next] net: dsa: mv88e6xxx: fix freeing unused SERDES IRQ

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 28 Aug 2019 14:55:11 -0400
From:   Vivien Didelot <vivien.didelot@...il.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net,
        Marek Behún <marek.behun@....cz>,
        f.fainelli@...il.com, andrew@...n.ch,
        Vivien Didelot <vivien.didelot@...il.com>
Subject: [PATCH net-next] net: dsa: mv88e6xxx: fix freeing unused SERDES IRQ

Now mv88e6xxx does not enable its ports at setup itself and let
the DSA core handle this, unused ports are disabled without being
powered on first. While that is expected, the SERDES powering code
was assuming that a port was already set up before powering it down,
resulting in freeing an unused IRQ. The patch fixes this assumption.

Fixes: b759f528ca3d ("net: dsa: mv88e6xxx: enable SERDES after setup")
Signed-off-by: Vivien Didelot <vivien.didelot@...il.com>
---
 drivers/net/dsa/mv88e6xxx/chip.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 6525075f6bd3..c648f9fbfa59 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -2070,7 +2070,8 @@ static int mv88e6xxx_serdes_power(struct mv88e6xxx_chip *chip, int port,
 		if (chip->info->ops->serdes_irq_setup)
 			err = chip->info->ops->serdes_irq_setup(chip, port);
 	} else {
-		if (chip->info->ops->serdes_irq_free)
+		if (chip->info->ops->serdes_irq_free &&
+		    chip->ports[port].serdes_irq)
 			chip->info->ops->serdes_irq_free(chip, port);
 
 		err = chip->info->ops->serdes_power(chip, port, false);
-- 
2.23.0